How can I trigger a picture to start animating just after the user scrolls it into the viewable area on their screen?
dunno if you will be able to do that, you may be able to do some thing in flash. Is there an example you have seen some where?
Unless the user hovers the mouse onto the image / flash area, then i don't think you can. What kind of animation are your talking about? Whatever the solution, Flash msy be the best bet.
OK so I could have a hidden div tag that spans the screen and when their mouse goes over that it triggers an event?